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GCN Circular 9875

GRB 090902B: Faulkes Telescope North observations
2009-09-03T10:09:22Z (15 years ago)
Cristiano Guidorzi at Ferrara U,Italy <>
C. Guidorzi (U. Ferrara), N.R. Tanvir (U. Leicester),
Z. Cano, I. A. Steele, A. Melandri, D. Bersier,
S. Kobayashi, C.J. Mottram, C.G.  Mundell,
R.J. Smith (Liverpool JMU), A. Gomboc (U. Ljubljana),
P. O'Brien (U. Leicester) on behalf of a large
collaboration report:

On 2009 September 03 at 07:50:02 UT we began observing
the Fermi GRB 090902B (Bissaldi et al., GCN 9866; de Palma
et al. GCN 9867, 9872) with the Faulkes Telescope North
using the R filter.

Within the Swift UVOT-enhanced XRT error circle (Evans et al.
GCN 9871) we clearly detect the afterglow candidate (Swenson et
al. GCN 9869, Perley et al. GCN 9870, Cucchiara et al. GCN 9873,
Olivares et al. GCN 9874) at the following position (J2000):

RA:   17:39:45.35
Dec: +27:19:27.1

with an uncertainty of 0.7". At the mid epoch of 21.01 hours
post burst we measure R=21.03 +- 0.11 mag.
Calibration was performed with the USNOB-1 star RA=17:39:42.74
Dec=+27:19:13.76 assuming R2=17.46.
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